package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 统计指定时间区间内的营业额数据
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内每天的日期
        List<LocalDate> dateList=new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //日期计算，计算指定日期后一天对应的日期
            begin=begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天的营业额
        List<Double> turnoverList=new ArrayList<>();
        for(LocalDate date:dateList){
            //查询date日期对应的营业额数据,营业额为状态“已完成”的订单金额合计
            LocalDateTime beginTime=LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime=LocalDateTime.of(date,LocalTime.MAX);
            Map map = new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover=orderMapper.sumByMap(map);
            turnover=turnover==null?0.0:turnover;
            turnoverList.add(turnover);
        }
        //StringUtils.join(dateList,",")是一个字符串
        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    /**
     * 统计指定时间区间内的用户数据
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内每天的日期
        List<LocalDate> dateList=new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //日期计算，计算指定日期后一天对应的日期
            begin=begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天的总用户数量
        List<Integer> totalUserList=new ArrayList<>();
        //存放每天的新增用户数量
        List<Integer> newUserList=new ArrayList<>();
        for(LocalDate date:dateList){
            //查询date日期对应的用户数据
            LocalDateTime beginTime=LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime=LocalDateTime.of(date,LocalTime.MAX);
            Map map = new HashMap();
            map.put("end",endTime);
            //总用户数量
            Integer totalUser=userMapper.countByMap(map);
            map.put("begin",beginTime);
            Integer newUser=userMapper.countByMap(map);
            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }
        //StringUtils.join(dateList,",")是一个字符串
        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .build();
    }

    /**
     * 统计指定时间区间内的订单数据
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内每天的日期
        List<LocalDate> dateList=new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //日期计算，计算指定日期后一天对应的日期
            begin=begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天的订单总数
        List<Integer> orderCountList=new ArrayList<>();
        //存放每天的有效订单数
        List<Integer> validOrderCountList=new ArrayList<>();
        //便利dateList集合，查询每天的有效订单数和订单数
        for(LocalDate date:dateList){
            //查询date日期对应的订单总数
            LocalDateTime beginTime=LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime=LocalDateTime.of(date,LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            //查询date日期对应的有效订单总数
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);
            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }
        //计算时间区间内的订单总数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //计算时间区间内的有效订单数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        //计算订单完成率
        Double orderCompletionRate=0.0;
        if (totalOrderCount!=0){
            orderCompletionRate=validOrderCount.doubleValue()/totalOrderCount;
        }
        //StringUtils.join(dateList,",")是一个字符串
        return OrderReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    private Integer getOrderCount(LocalDateTime begin,LocalDateTime end,Integer status){
        Map map = new HashMap();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status", status);
        return orderMapper.countByMap(map);
    }

    /**
     * 统计指定时间区间内的销量排名top10
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10Statistics(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime=LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime=LocalDateTime.of(end,LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10=orderMapper.getSalesTop10(beginTime,endTime);
        List<String> name=salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList=StringUtils.join(name,",");
        List<Integer> numbers=salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList=StringUtils.join(numbers,",");
        //返回结果封装数据
        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 导出运营数据报表
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response) {
        //查询数据库，获取最近30天营业数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd=LocalDate.now().minusDays(1);
        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService
                .getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));
        //通过POI将数据写入excel文件
        InputStream in=this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            //基于模板文件创建一个新的excel文件
            XSSFWorkbook excel=new XSSFWorkbook(in);
            //获取表格文件的sheet页
            XSSFSheet sheet = excel.getSheet("sheet1");
            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间："+dateBegin+"至"+dateEnd);
            //获取第四行
            XSSFRow row = sheet.getRow(3);
            //获取第三个单元格
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            //获取第五行
            row= sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());
            //填充明细数据、
            for (int i = 0; i < 30; i++) {
                LocalDate date=dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService
                        .getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }
            //通过输出流将excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
